2 Answers
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If you have system console, you can issue an "init 0" to shut the machine down without rebooting. This should drop you to an "ok". You may need to send a stop-a if the "ok" doesn't appear. Sometimes the system hangs going down.

Access Method --> What to Do (1) Graceful shutdown of the Solaris OS --> From a shell or command tool window, issue an appropriate command (for example, the shutdown or init command) as described in Solaris system administration documentation. (2) L1-A (Stop-A) keys or Break key --> From a Sun keyboard connected directly to the Sun Fire V445 server, press the Stop and A keys simultaneously. -or- From an alphanumeric terminal configured to access the system console, press the Break key.
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NeonMar 24 at 14:44

(3)ALOM system controller console or break command From the sc> prompt, type the break command. The console command also works, provided the OS software is not running and the server is already under OpenBoot firmware control. (4) Externally initiated reset (XIR) --> From the sc> prompt, type the reset -x command. (5) Manual system reset --? From the sc> prompt, type the reset command.
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NeonMar 24 at 14:44